diff --git a/src/flow/binary.rs b/src/flow/binary.rs
index e67f2b8..113f999 100644
--- a/src/flow/binary.rs
+++ b/src/flow/binary.rs
@@ -70,10 +70,10 @@ pub trait BinaryTreesMutable<'a>: BinaryTreesEmpty<'a> + BinaryTreesTreeOf<'a> {
 
     fn join(self, tl: Self::Tree, tr: Self::Tree) -> BTWrap<'a, Self, Self::Tree> {
         let Some(rl) = self.refer(&tl) else {
-            return Self::pure(tr)
+            return Self::pure(tr);
         };
         let Some(rr) = self.refer(&tr) else {
-            return Self::pure(tl)
+            return Self::pure(tl);
         };
         Self::T::bind2(self.resolve(&rl), self.resolve(&rr), move |nl, nr| {
             let (tll, tlr, kl) = self.split(&nl);